Saleev I. Scientific substantiation of rational solutions for mining and technological problems during the closure of coal mines in Ukraine

Salieiev I.A. Scientific substantiation of rational solutions for mining and technological problems during the closure of coal mines in Ukraine – Qualifying scientific work as a manuscript. Dissertation submitted for the degree of Doctor of Philosophy in the specialty 184 – “Surface Mining”, – Dnipro University of Technology, Ministry of Education and Science of Ukraine, Dnipro, 2021. The presented dissertation is a completed scientific-research work, which provides a scientific substantiation and also gives a new research and practice solution to an important scientific task. This task is to determine the patterns of the combined elastic axisymmetric load of timbering with the rock mass and the hydrodynamic plane-radial flow of water into the flooded shaft, as well as the patterns of the increase in mine working contour displacements with a geomechanical indicator of the conditions for their maintainance. All this together has formed a scientific mining-engineering base for the closure of coal mines. Based on the analysis of literature sources and project documentation for the closure of coal mines in Europe and Ukraine, it can be argued that the main problems, namely, technical, environmental, legislative and financial, constitute a single structure. This research deals with the problem of minimizing the risks of closing coal mines in Ukraine in terms of geomechanical, technological and hydrogeological factors. In particular, it is aimed at determining the patterns of the rock pressure manifestation development in underground mine workings, which are consistently decommissioned, and the development of a methodology for assessing their state at the present time; substantiating the parameters for the technology and complex of equipment for desalination of mine waters with the production of secondary raw materials – mineral salts for use in economic activities; substantiating the recommendations for regulating the hydraulic regime of mine waters to minimize waterlogging of the earth's surface in the adjacent area.